Promise Melody

Exploration Stage: Stargazing Terrace
From: Arcturus Star
Description: There was no response from the master. He once told me that he gave all the members of the guardians a special instrument and told them that if they played it, they would be heard wherever they were. So I tried to play the instrument, but nothing happened. See, now that you've tried it, give it a try.
Completed: You played a very beautiful melody, but I still didn't get any response from the master. I feared that something had happened to my fellow guardians, but my first priority had to be to save my own daughter.